Thermometer



(Modhel.)

E. WEINEAGEN.

E y THERMOMETER. Noyz'aao; i Patented May 29W, 11883.

ot' Hoboken,

any other suitable form, so long as it joins the 40 5o they are alike,the instrument will be in proper `mometer seen from its iiat side a,Fig. 3. Fig.

Fig. 3 is'a cross-section,

Asimilar sections ofmoditications Vof the instrut surfaces, all ashereinafter more fully described.

junctions of theat side of the thermometer tened face, a. By attened, inthis connecscales beingeither one like the other or one PATENT OFFICE.

Ernani? WEINHAGEN, oEHoBoxnN, NEW JERsEY.

,SPECIFICATION forming part of Letters Application tiled February 8,1883. (Model.)

To` all whom 'it may` concern Be it` known `that I, HENRY WEINHAGEN, yin the county of Hudson and` State of New Jersey, have `invented anImproved Thermometer, ot'whiclr the following, is a specication.

Figure lis an elevation of my improved ther- 2 is an elevationoftheinstrument when looked at in the direction of the dotted line bf,Fig.

on an .enlarged scale, of the instrument. Figs. 4 and 5 are ment. l

- The object o f this'in-vention is to produce a magnifying-thermometeron whichthe mercury column and the scale will be superposed, and nearthe edge of` the enamel reticctor, so

as to be perceived at a glance in the same row or line, which line atthe same time 4is made the line of enlargement, so far as the appearanceof the mercury column is concerned.

The invention consists in combining a liatfaeed thermometertube with aninlaid enamel for the background, and in providing it with a scale atthejunction of its convex and iiat The invention also consists inproviding both with the convex face with separate scales, and in soshaping the inlaid enamel as to be a reiiector andan eye-guide for eachof the scales, as hereinafter more fully described. I

ln the drawings, A represents a thermometer-tube made of glass, and madewith a fiattion, I mean a face either perfectly iiat, as shown in Figs.3, 4, and 5, or nearly so, or of convex portion d of the circumferenceof the thermometer-tube by one or incre small curves, c e. 1,The bore fof the tube is by preference elongated, as shown.' There is a scale, g,at one junction of the flat side a with the con vex sided,and `there maybe another scale, 7L, at the other junction 'ot said at and convexsides, as clearly shown in Fig.3, lthe said different from the other, asmay be desired. If

position forobservation, no matterhowit happens to lie in the hand ofthepartyusing it. If

Patent No. 278,380, dated May 29,1883.

| madewith separate scales-such, for example,

as Reanmur and Fahrenheit, or Fahrenheit "and Celsius-theobservation'can bemade on either.` ofthe scales, as may be mostadvantageous. In `the body of the tube A, between its curvilinearcircumference d and it's boref, is contained the enamel t, which is toconstitute the reflectingsurface for the mercury column and the scale.Thisenamel is 'laid in preferably curvilinear form into the body ot' theglass, so as to extendnearly from the line b fto the line h j', as shownin Fig. 3; but it should not quite run to these lines. The said linesbfand h f are the lines ot observation for the instrument. A glance atFig. 3 will show that the enamel z' will be a reflecting-body forthemercury column, and also for the corresponding scale, `no

`matter which ofthe lines bfor h fis used as a line of observation atany one time. At the same time the enamel, coming very near to the lineof observation, makes the use of the instrument convenientthat is' tosay, in magnifying-thermometers as they had heretofore been made it wasusually a 'matter of greater or less difticnlty to find the correctposition for the observation ofthe instrument, so that` the greatestenlargement ot' the mercury column would be realized. Persons handlingthese instruments were apt to waste much time in their endeavors to findthe correct pofailed to lind it at all, and had to use for theirexamination of the instrument the reduced appearance of the mercurycolumn.

`sition for such inspection, and frequently they By the use of myimproved thermometer as shown in Fig. 3 the inspector, holding the instrument in his hand, will examine it directly above the edge of theenamel t', andrwill at that place iind the correct position for theexamination ot' the instrument. ln other words, when the instrument isheld in the hand so that the mercury column is entirely concealed by theenamel, and then gradually turned so as to bring the edge of lthe enamelopposite the eye, the enlarged mercury column will ap- 'pear t`o lie onthe enamel, and Will then be traversed by the corresponding scale, sothat the examination of the instrument will be at Vtended with nofurtherdifficulty;` but, on the. contrary, the mercury column will appear to bein a state of support on the enamel, and

`:the dicult feat heretofore required cf draw"l I ing imaginary linesfrom that column to the gradations of the scale willbe avoided. Theresult thus indicated, and which Fig. 2 is intended to show, will be thesame whether the instrument is looked at on the line b for onv the lineh f.

Although it is quite desirable to thus make a double instrument capableof use with a double scale, yet the main advantages of my invention willbe enjoyed even where the instrument has but one scale, as indicated inFig. 4, where the enamel t is vcarried beyond -the line h f, so as toprevent the mercury column being seen on thatline, allowing it to beonly inspected on the line bf.

Fig. 5 shows afurthermodication of that which is indicated in Fig. 3,said modification consisting in a different form of enamel t',

. which difference in form, however, will, as is clear from aninspection of the drawings, produce no substantial difference in effect.

I desire to have it particularly understood that I regard it as aspecial advantage to place the enamel i as near to the mercury-bore f aspossible, and as far away from the circumference of the glass asconvenient, for it must be quite clear that the advantages of certaintyof examination above alluded to are obtained by bringingthe enamelasfarintotheinteriorof the instrument as possible. In order t'o makethis quite clear, the lines bf and hf have been continued in Fig. 3beyond the mercury-bore, and a curved dotted line, j, is drawn on theouter side of the instrument to indicate the place of the ordinaryenamel backing, which place .would be the correct one for observing theinstrument from either scale g or h.' It will at once be perceived thatsuch an exterior backing ot' enamel, in that it does not reach near tothe lines b f and h f, deprives the observer of the facility of findingthe enlarged appearance of the mercury column, which, with the interiorenamel, fi, is found by looking over the edge of the enamel. If, on theother hand, such outside enamel, j, should be carried close to the linesb f and h f, the result would be that theopportunity of lapping thescales g h over the angles4 of the instrument would be lost.

By enamel reflector i I mean a reiiector made of any suitable material.

I claim- 1. In a thermometer having lat face a and curved face d, and`scale g at the junction of said faces, the combination thereof with theenamel reector i, which extends near to ay line. drawn from the bore ofthe instrument through the scale g, as specified.

2. A thermometer having scales g It at the junctions of its faces a d,and having inner bore, f, in combination with the enamel relector Vt',which is interposed between the bore and the circumference of thethermometer, and extends from near the line thatjoins the bore with onescale to near the line that joins the bore with the other scale,substantially as described.

3. In a thermometer, the enamel reilector fi, placed around the bore f,so as to embrace it on two sides and extend behind it, substantially asherein shown and described.

HENRY WRINHAGRN.j`

Witnesses:

HARRY SMITH, WILLY G. E. SCHULTZ.

